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The arXiv and OpenAlex title resolvers called two hardcoded endpoints with a hand-written "Odysseus/0.20" User-Agent, no outbound-URL policy, and a full 12s timeout each. APP_VERSION was already 1.0.3, so the agent string was wrong the moment it was written, and a scholarly query could hold a user-facing search open for the sum of all three hops. Move the endpoints to named constants, build the User-Agent from APP_VERSION, run both calls through check_outbound_url (they follow redirects, so the final host is not the one in the constant), and give the whole SearXNG -> OpenAlex -> arXiv chain one shared wall-clock budget. The budget is a ContextVar rather than a parameter so the existing test doubles for _openalex_title_results and _arxiv_title_results keep working unchanged.